I'm going to purchase the canon T2i kit lens and 55-250mm lens combo on Newegg. I'm also thinking of purchasing the 50mm 1.8 lens for low-light shoot indoors. Is this a good start for a beginner using a dslr or am I "putting too many eggs in one basket"?

sounds like a good start for your lenses - my only question mark would be the 55-250mm - i'm not sure if its this lens or not but i know from reading on here that there is a canon lens in this range that isn't so good

so i would find out if its this lens or another then make sure you get the good one otherwise like i said - good start with room to photograph good range of subjects and the prime will get you good low light performance

the ef-s 55-250 is a good consumer grade telezoom, sharp and produce good photos. There are better but at much higher cost. I have it with my 70-300 and form the same ranges it is almost as sharp as the 70-300.

I like to shoot my cats, nieces, at family gathering like on Thanksgiving and Christmas, and I would like to learn about shooting wildlife such as birds, seeguell and squirrel(those are the only animals that live NYC), and random objects(books, cans, cups) just to get a different perspective.
Are the kits lens that come with the T2i good in indoor lighting with regular light bulbs(incandescent light bulb)?

@shoturtle and John.Pattullo: Thanks for your advise. I'll hold off buying the 50mm 1.8 for a couple weeks to I become comfortable with my new camera.

For shooting indoors with available light, the kit 18-55 isn't fast enough, and the 50/1.8 often won't be wide enough. You may want to go with any of the Canon 30mm f/2 or Sigma 28mm f/1.8, 30mm f/1.4, or 24mm f/1.8. Since the T2i does well at higher ISOs, you may be able to do well with either the Sigma 18-50/2.8 or Tamron 17-50/2.8, but they aren't stabilized, and the stabilized equivalents aren't as good.

Or you could get a good external flash.

Also, for small wildlife, the 55-250 isn't very long. NYC squirrels are relatively tame, so it may work out for them, but for other wildlife you probably won't get the results you expect.